Mr Johnson will today hail Brexit as a cause for “hope not fear” in a passionate rallying cry
And he will also warn that any concession to demands from hard-line Remainers to dilute the break from the EU would be “a disastrous mistake”.
His remarks today, in the first of a series of high-profile speeches from senior Cabinet ministers designed to flesh out the Government’s Brexit plans, is designed to inject some passion and optimism into the debate around Britain’s departure from the EU.
It will also been seen as a warning to Theresa May not to give in to pro-Brussels Cabinet ministers attempting to halt a clean break with the EU.
Some Tories fear Mr Johnson could quit the Government if the Prime Minister fails to face down pro-Brussels Tories including Chancellor Philip Hammond demanding continuing close ties to Brussels.
In his speech in Westminster today, the Foreign Secretary will say that leaving the EU is “not grounds for fear, but hope”.
Mr Johnson, who was one of the most high-profile backers of the Leave campaign in the run up to the 2016 EU referendum, is to say the time has come for politics to move on from the divisions of the past.
He will also set out his ideas for reuniting the country – and the bitterly divided Tory party – by insisting that Britain can succeed as a “great global power” and an independent nation.
Some Tories are certain to see his speech today as his blueprint for an alternative Brexit vision should the Prime Minister be forced out of Downing Street.
Mr Johnson will also set out his ideas for reuniting the country
The Foreign Secretary is expected to say: “I fear that some people are becoming ever more determined to stop Brexit, to reverse the referendum vote of June 23 2016, and to frustrate the will of the people.
“I believe that would be a disastrous mistake that would lead to permanent and ineradicable feelings of betrayal.
“We cannot and will not let it happen.
“But if we are to carry…